Perhaps you should try some spelling variations:
kxy thuat » ky thuat, ki thuat, my thuat
sach kxy » sach xa, sach kem, sac ky
thuat bo » thuat bao, thuat do, thuat co
tu sach » thu sach, te sach, tu cach
thuat o » thuat do
su sach » so sach, vu sach
bo khi » co khi, bo chi, bo thi
o khi » co khi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((( tu sach kxy thuat o khi ) or ( su sach kxy thuat o khi ))) or ( tu sach kxy thuat bo khi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( tu sach kxy thuat o khi ) OR ( su sach kxy thuat o khi ))) OR ( tu sach kxy thuat bo khi )).
• Adding a wildcard symbol may retrieve word variants: (((( tu sach kxy thuat o khi ) or ( su sach kxy thuat o khi ))) or ( tu sach kxy thuat bo khi ))*.